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// Other services

Port 1371: Fujitsu Config Protocol

Port 1371 is assigned by IANA to fc-cli (Fujitsu Config Protocol).

1371

How fc-cli works

Other services
client:1371fc-cliresponse client:1371fc-cliresponse

The client sends a request to port 1371 and the fc-cli service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1371 dangerous?

We have no specific security note for port 1371. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1371

ServicePortTransportDescriptionReferenceUpdated
fc-cli 1371 TCP, UDP Fujitsu Config Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1371, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1371'      # process listening on 1371
sudo lsof -nP -i :1371

macOS

sudo lsof -nP -i :1371

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1371 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1371
netstat -ano | findstr :1371

From another machine

nmap -p 1371 -sV <host>
sudo nmap -sU -p 1371 <host>
nc -zv <host> 1371

Block it in the firewall

sudo ufw deny 1371/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1371" -Direction Inbound -LocalPort 1371 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1371 used for?

Port 1371 is assigned by IANA to fc-cli (Fujitsu Config Protocol).

Is port 1371 TCP or UDP?

Port 1371 is registered for TCP and UDP.

Is it safe to open port 1371?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1371 is open?

On Linux run "ss -ltnup 'sport = :1371'", on macOS "lsof -nP -i :1371", and on Windows "netstat -ano | findstr :1371" to see the local process. From another machine, "nmap -p 1371 <host>" shows whether it is reachable.

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